LDAP changes break `method`; breaks backward compatibility
Looks like changes in 94b4c9f3 break backward compatibility with the old
method configuration in
gitlab.yml. We should accept both until at least 10.0. We have customers hitting this - https://gitlab.zendesk.com/agent/tickets/81235
Interestingly, the commit is 2 months old but if you look at the branches/tags it's present in, it only shows in 9.5 RCs. That can't be right.